The actress, who is now signed to Fox's Glee, briefly reprised her role earlier this season when Hiro travelled back in time to try to save Charlie.

Shortly afterwards, Robert Knepper's Samuel trapped Charlie in time, and Hiro has been fighting to find her ever since.

Oka told TV Guide of a possible return: "Let's put it this way: He has to find Charlie and it will be resolved by the Winter Olympics. I can't say what kind of reunion it will be, but there will be a resolution.

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"Whether it's good or not, the audience will have to decide. But it won't just be talked about - like, 'Oh well, she's lost in time. Too bad!'."